from PIL import Image
import argparse

# 命令行参数处理
parser = argparse.ArgumentParser()
parser.add_argument('file')
parser.add_argument("-o","--output")
parser.add_argument('--width',type=int,default = 100)
parser.add_argument('--height',type=int,default=60)
#获取参数
args = parser.parse_args()

IMG = args.file
WIDTH = args.width
HEIGHT = args.height
OUTPUT = args.output

ascii_char = list("$@B%8&WM#*oahkbdpqwmZO0QLCJUYXzcvunxrjft/\|()1{}[]?-_+~<>i!lI;:,\"^`'. ") 
def get_char(r,g,b,alpha = 256):
    if alpha == 0:
        return ' '
    length = len(ascii_char)
    gray = int(0.2126 * r + 0.7152 * g + 0.0722 * b)
    unit = (256.0+1)/length
    return ascii_char[int(gray/unit)]

if __name__ == '__main__':
    im = Image.open(IMG)
    im = im.resize((WIDTH,HEIGHT),Image.NEAREST)
    txt = ""

    for i in range(HEIGHT):
        for j in range(WIDTH):
            txt += get_char(*im.getpixel((j,i)))
        txt += '\n'
    print(txt)

    fileName = 'out_put.txt'

    #字符画输出到文件
    if OUTPUT:
        fileName = OUTPUT
    with open(fileName,'w') as f:
            f.write(txt)
